"Unreachable" methods are those which are unreachable by Perl's left-most, depth-first inheritance search order. I don't have support for C3. Also, it's possible to call "unreachable" methods by explicit name and I can't check for that (even PPI would have limitations here), but so far, I'm pretty pleased with this.

Update: OK, I lied. I just added docs and it's on its way to the CPAN.

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